Gravity Falls VS the Forces of Evil (Crossover Fan Fic)

In the sleepy town of Oregon, it's going to get a little weirder, it's going to get a little wilder. When two teens arrive out of the portal, Stan's plan is ruined. As Mabel and Dipper get to know their new guests, they discover their names are Star Butterfly and Marco Diaz. Dipper, being the monster hunter he is, so...